Add httpcl::Settings::updateTimestamp

libs/httpcl/include/httpcl/http-settings.hpp

@@ -94,6 +94,15 @@ struct Settings
      */
     std::vector<Config> settings;
     YAML::Node document;
+    mutable std::shared_mutex mutex;
+    std::chrono::steady_clock::time_point lastRead;
+
+    /**
+     * Prompt settings instance to re-parse the HTTP settings file,
+     * by calling updateTimestamp with std::chrono::steady_clock::now().
+     */
+    static void updateTimestamp(std::chrono::steady_clock::time_point time);
+    static std::atomic<std::chrono::steady_clock::time_point> lastUpdated;
 };
 
 struct secret

libs/httpcl/src/http-settings.cpp

@@ -332,8 +332,16 @@ Settings::Settings()
     load();
 }
 
+std::atomic<std::chrono::steady_clock::time_point> Settings::lastUpdated{std::chrono::steady_clock::now()};
+
+void Settings::updateTimestamp(std::chrono::steady_clock::time_point time) {
+    lastUpdated.store(time, std::memory_order_relaxed);
+}
+
 void Settings::load()
 {
+    std::unique_lock lock(mutex);
+    lastRead = std::chrono::steady_clock::now();
     settings.clear();
 
     auto cookieJar = std::getenv("HTTP_SETTINGS_FILE");
@@ -412,15 +420,20 @@ Config::Config(const std::string& yamlConf)
 
 Config Settings::operator[] (const std::string &url) const
 {
-    Config result;
+    std::shared_lock lock(mutex);
+    if (lastRead < lastUpdated.load(std::memory_order_relaxed)) {
+        lock.unlock();
+        const_cast<Settings*>(this)->load();
+        lock.lock();
+    }
 
+    Config result;
     for (auto const& config : settings)
     {
         if (!std::regex_match(url, config.urlPattern))
             continue;
         result |= config;
     }
-
     return result;
 }